package nju.mscs.businesslogic;

public interface SellGoods {
	public int useVIP(String id);
	public String[] addGoods(String id,int n);
	public void deleteGoods(String id,int n);
	public double[] calculate(int point);
	public double change(double money);
	public String[] getGift();
	public boolean store();
//	public void takeReceipts();
}
